/**
* Convert to valid slug.
* @param string $value value to convert
* @param string $default default value
* @return string
*/
static function toSlug($value, $default = 'n-a')
{
// replace non letter or digits by -
$text = preg_replace('~[^\\pL\\d]+~u', '-', $value);
// trim
$text = trim($text, '-');
// transliterate
$text = v::translit($text);
if (function_exists('iconv')) {
$text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);
}
// lowercase
$text = strtolower($text);
// remove unwanted characters
$text = preg_replace('~[^-\\w]+~', '', $text);
return $text != '' ? $text : $default;
}
